美国物理奥林匹克竞赛2015试题.pdf

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1、2015F=maExam1AAPTUNITEDSTATESPHYSICSTEAMAIP20152015F=maContest25QUESTIONS-75MINUTESINSTRUCTIONSDONOTOPENTHISTESTUNTILYOUARETOLDTOBEGINUseg=10N=kgthroughoutthiscontest.Youmaywriteinthisbookletofquestions.However,youwillnotreceiveanycreditforanythingwritteninthisbooklet.Youranswert

2、oeachquestionmustbemarkedontheopticalmarkanswersheet.Selectthesingleanswerthatprovidesthebestresponsetoeachquestion.PleasebesuretouseaNo.2pencilandcompletelylltheboxcorrespondingtoyourchoice.Ifyouchangeananswer,thepreviousmarkmustbecompletelyerased.Correctanswerswillbeawardedonep

3、oint;incorrectanswersandleavingananswerblankwillbeawardedzeropoints.Thereisnoadditionalpenaltyforincorrectanswers.Ahand-heldcalculatormaybeused.Itsmemorymustbeclearedofdataandprograms.Youmayuseonlythebasicfunctionsfoundonasimplescienticcalculator.Calculatorsmaynotbeshared.Cellphon

4、esmaynotbeusedduringtheexamorwhiletheexampapersarepresent.Youmaynotuseanytables,books,orcollectionsofformulas.Thistestcontains25multiplechoicequestions.Youranswertoeachquestionmustbemarkedontheopticalmarkanswersheetthataccompaniesthetest.Onlytheboxesprecededbynumbers1through25areto

5、beusedontheanswersheet.Allquestionsareequallyweighted,butarenotnecessarilythesamelevelofdiculty.Inordertomaintainexamsecurity,donotcommunicateanyinformationaboutthequestions(ortheiranswersorsolutions)onthiscontestuntilafterFebruary20,2015.Thequestionbookletandanswersheetwillbeco

6、llectedattheendofthisexam.Youmaynotusescratchpaper.DONOTOPENTHISTESTUNTILYOUARETOLDTOBEGINCopyrightc2015AmericanAssociationofPhysicsTeachers2015F=maExam21.A600meterwideriver owsdirectlysouthat4.0m/s.Asmallmotorboattravelsat5.0m/sinstillwaterandpointsinsuchadirectionsothatitwilltrave

7、ldirectlyeastrelativetotheland.4m/s600mThetimeittakestocrosstheriverisclosestto(A)67s(B)120s(C)150s(D)200s(E)600s2.Acartravelsdirectlynorthonastraighthighwayataconstantspeedof80km/hrforadistanceof25km.Thecarthencontinuesdirectlynorthataconstantspeedof50km/hrforadistanceof75morekilom

8、eters.Theaveragespe